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Tracking down calls to AvSetMmThreadCharacteristics ...
https://matthewvaneerde.wordpress.com/2018/09/13/tracking-down-calls-to-avsetmmthreadcharacteristics/
Boring introductory stuff first: Windows Vista introduced a feature called the "Multimedia Class Scheduler Service" (MMCSS). This is designed to give audio and video threads regular, short, bursts of very high priority, so that audio and video can stream without glitching. The bursts are regular so that audio and video packets don't get delayed, and…
AvSetMmThreadCharacteristicsA function (avrt.h) - …
https://docs.microsoft.com/en-us/windows/win32/api/avrt/nf-avrt-avsetmmthreadcharacteristicsa
The avrt.h header defines AvSetMmThreadCharacteristics as an alias which automatically selects the ANSI or Unicode version of this function based on the definition of the UNICODE preprocessor constant. Mixing usage of the encoding-neutral alias with code that not encoding-neutral can lead to mismatches that result in compilation or runtime errors.
AvSetMmThreadCharacteristics fails with error 565 …
https://social.msdn.microsoft.com/Forums/en-US/78845249-cadf-4015-9b32-18b58ccafa00/avsetmmthreadcharacteristics-fails-with-error-565-errortoomanythreads
At the beginning of our audio threads, we call AvSetMmThreadCharacteristics (). This has historyically been functional and stable. Recently we have seen a few failures with GetLastError () returning 565, which resolves to ERROR_TOO_MANY_THREADS and has the following description.
LNK 2019 for AvSetMmThreadCharacteristics- Error in …
https://social.msdn.microsoft.com/Forums/windowsdesktop/en-US/a55a965c-ef35-4305-a543-3e6c3c61dbef/lnk-2019-for-avsetmmthreadcharacteristics-error-in-wasapi-code
Whenever you call a Windows SDK function, you need to #include the right .h file (in this case, avrt.h) and you also need to link against the right .lib file (in this case, avrt.lib.
c++ - Can I set a single thread's priority above 15 for a ...
https://stackoverflow.com/questions/10639285/can-i-set-a-single-threads-priority-above-15-for-a-normal-priority-process
Next thing to try is calling AvSetMmThreadCharacteristics ("Pro Audio") Update: Scheduling heartbeat thread as "Pro Audio" does work to increase the thread's priority beyond 15 (Base=1, Dynamic=24) but it doesn't seem to make any real difference when defrag is running.
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